swh.scheduler.backend module#
- swh.scheduler.backend.adapt_LastVisitStatus(v: LastVisitStatus)[source]#
- class swh.scheduler.backend.SchedulerBackend(db, min_pool_conns=1, max_pool_conns=10)[source]#
Bases:
object
Backend for the Software Heritage scheduling database.
- Parameters:
db_conn – either a libpq connection string, or a psycopg2 connection
- current_version = 33#
- task_type_keys = ['type', 'description', 'backend_name', 'default_interval', 'min_interval', 'max_interval', 'backoff_factor', 'max_queue_length', 'num_retries', 'retry_delay']#
- create_task_type(task_type)[source]#
Create a new task type ready for scheduling.
- Parameters:
task_type (dict) –
a dictionary with the following keys:
type (str): an identifier for the task type
description (str): a human-readable description of what the task does
backend_name (str): the name of the task in the job-scheduling backend
default_interval (datetime.timedelta): the default interval between two task runs
min_interval (datetime.timedelta): the minimum interval between two task runs
max_interval (datetime.timedelta): the maximum interval between two task runs
backoff_factor (float): the factor by which the interval changes at each run
max_queue_length (int): the maximum length of the task queue for this task type
- get_listers_by_id(lister_ids: List[str]) List[Lister] [source]#
Retrieve listers in batch, using their UUID
- get_lister(name: str, instance_name: Optional[str] = None) Optional[Lister] [source]#
Retrieve information about the given instance of the lister from the database.
- get_or_create_lister(name: str, instance_name: Optional[str] = None) Lister [source]#
Retrieve information about the given instance of the lister from the database, or create the entry if it did not exist.
- update_lister(lister: Lister) Lister [source]#
Update the state for the given lister instance in the database.
- Returns:
a new Lister object, with all fields updated from the database
- Raises:
StaleData if the updated timestamp for the lister instance in –
database doesn’t match the one passed by the user.
- record_listed_origins(listed_origins: Iterable[ListedOrigin]) List[ListedOrigin] [source]#
Record a set of origins that a lister has listed.
This performs an “upsert”: origins with the same (lister_id, url, visit_type) values are updated with new values for extra_loader_arguments, last_update and last_seen.
- get_listed_origins(lister_id: Optional[UUID] = None, url: Optional[str] = None, enabled: Optional[bool] = True, limit: int = 1000, page_token: Optional[Tuple[str, str]] = None) PaginatedListedOriginList [source]#
Get information on the listed origins matching either the url or lister_id, or both arguments.
- grab_next_visits(visit_type: str, count: int, policy: str, enabled: bool = True, lister_uuid: Optional[str] = None, lister_name: Optional[str] = None, lister_instance_name: Optional[str] = None, timestamp: Optional[datetime] = None, absolute_cooldown: Optional[timedelta] = datetime.timedelta(seconds=43200), scheduled_cooldown: Optional[timedelta] = datetime.timedelta(days=7), failed_cooldown: Optional[timedelta] = datetime.timedelta(days=14), not_found_cooldown: Optional[timedelta] = datetime.timedelta(days=31), tablesample: Optional[float] = None) List[ListedOrigin] [source]#
- task_create_keys = ['type', 'arguments', 'next_run', 'policy', 'status', 'retries_left', 'priority']#
- task_keys = ['type', 'arguments', 'next_run', 'policy', 'status', 'retries_left', 'priority', 'id', 'current_interval']#
- create_tasks(tasks, policy='recurring')[source]#
Create new tasks.
- Parameters:
tasks (list) –
each task is a dictionary with the following keys:
type (str): the task type
arguments (dict): the arguments for the task runner, keys:
args (list of str): arguments
kwargs (dict str -> str): keyword arguments
next_run (datetime.datetime): the next scheduled run for the task
- Returns:
a list of created tasks.
- set_status_tasks(task_ids: List[int], status: str = 'disabled', next_run: Optional[datetime] = None)[source]#
Set the tasks’ status whose ids are listed.
If given, also set the next_run date.
- search_tasks(task_id=None, task_type=None, status=None, priority=None, policy=None, before=None, after=None, limit=None)[source]#
Search tasks from selected criterions
- peek_ready_tasks(task_type: str, timestamp: Optional[datetime] = None, num_tasks: Optional[int] = None) List[Dict] [source]#
- grab_ready_tasks(task_type: str, timestamp: Optional[datetime] = None, num_tasks: Optional[int] = None) List[Dict] [source]#
- peek_ready_priority_tasks(task_type: str, timestamp: Optional[datetime] = None, num_tasks: Optional[int] = None) List[Dict] [source]#
- grab_ready_priority_tasks(task_type: str, timestamp: Optional[datetime] = None, num_tasks: Optional[int] = None) List[Dict] [source]#
- task_run_create_keys = ['task', 'backend_id', 'scheduled', 'metadata']#
- schedule_task_run(task_id, backend_id, metadata=None, timestamp=None)[source]#
Mark a given task as scheduled, adding a task_run entry in the database.
- Parameters:
task_id (int) – the identifier for the task being scheduled
backend_id (str) – the identifier of the job in the backend
metadata (dict) – metadata to add to the task_run entry
timestamp (datetime.datetime) – the instant the event occurred
- Returns:
a fresh task_run entry
- mass_schedule_task_runs(task_runs)[source]#
Schedule a bunch of task runs.
- Parameters:
task_runs (list) –
a list of dicts with keys:
task (int): the identifier for the task being scheduled
backend_id (str): the identifier of the job in the backend
metadata (dict): metadata to add to the task_run entry
scheduled (datetime.datetime): the instant the event occurred
- Returns:
None
- start_task_run(backend_id, metadata=None, timestamp=None)[source]#
- Mark a given task as started, updating the corresponding task_run
entry in the database.
- Parameters:
backend_id (str) – the identifier of the job in the backend
metadata (dict) – metadata to add to the task_run entry
timestamp (datetime.datetime) – the instant the event occurred
- Returns:
the updated task_run entry
- end_task_run(backend_id, status, metadata=None, timestamp=None, result=None)[source]#
Mark a given task as ended, updating the corresponding task_run entry in the database.
- Parameters:
backend_id (str) – the identifier of the job in the backend
status (str) – how the task ended; one of: ‘eventful’, ‘uneventful’, ‘failed’
metadata (dict) – metadata to add to the task_run entry
timestamp (datetime.datetime) – the instant the event occurred
- Returns:
the updated task_run entry
- filter_task_to_archive(after_ts: str, before_ts: str, limit: int = 10, page_token: Optional[str] = None) Dict[str, Any] [source]#
Compute the tasks to archive within the datetime interval [after_ts, before_ts[. The method returns a paginated result.
- Returns:
next_page_token: opaque token to be used as page_token to retrieve the next page of result. If absent, there is no more pages to gather.
tasks: list of task dictionaries with the following keys:
id (str): origin task id started (Optional[datetime]): started date scheduled (datetime): scheduled date arguments (json dict): task’s arguments …
- Return type:
dict with the following keys
- delete_archived_tasks(task_ids)[source]#
Delete archived tasks as much as possible. Only the task_ids whose complete associated task_run have been cleaned up will be.
- task_run_keys = ['id', 'task', 'backend_id', 'scheduled', 'started', 'ended', 'metadata', 'status']#
- origin_visit_stats_upsert(origin_visit_stats: Iterable[OriginVisitStats]) None [source]#
- update_metrics(lister_id: Optional[UUID] = None, timestamp: Optional[datetime] = None) List[SchedulerMetrics] [source]#
Update the performance metrics of this scheduler instance.
Returns the updated metrics.
- Parameters:
lister_id – if passed, update the metrics only for this lister instance
timestamp – if passed, the date at which we’re updating the metrics, defaults to the database NOW()
- get_metrics(lister_id: Optional[UUID] = None, visit_type: Optional[str] = None) List[SchedulerMetrics] [source]#
Retrieve the performance metrics of this scheduler instance.
- Parameters:
lister_id – filter the metrics for this lister instance only
visit_type – filter the metrics for this visit type only